diff --git a/admin_manual/configuration/encryption_configuration.rst b/admin_manual/configuration/encryption_configuration.rst
index 90352c10c..0e265c4b9 100644
--- a/admin_manual/configuration/encryption_configuration.rst
+++ b/admin_manual/configuration/encryption_configuration.rst
@@ -9,6 +9,9 @@ Dropbox and Google Drive) will be encrypted by the ownCloud server, and upon
 retrieval, decrypted before serving them to you and anyone you have shared them 
 with.
 
+.. note: Encrypting files increases their size by roughly 35%, so you must take this into 
+   account when you are provisioning storage and setting storage quotas.
+
 When files on external storage are encrypted in ownCloud, you cannot share them 
 directly from the external storage services, but only through ownCloud sharing 
 because the key to decrypt the data never leaves the ownCloud server.